Multipled block codes for all-optical transports

Multipled block codes (MBCs) for all-optical transport are investigated. Each block of the MBC comprises N subblocks, each n bits in length. A feature of the MBC family is that the clock component can be recovered through logical processing. First, coding efficiency is studied to show that choosing n=2N results in the maximum efficiency. Next, the jitter problem due to deviations in processing delays is investigated. Recovery of the clock component by the combined use of delay-and-multiply and delay-and-add logical processing is investigated. Numerical and simulation results show that the former causes no jitter when the pulse duty is chosen adequately, and only minor jitter is generated due to the latter. Applications of this type of line code to various systems such as trunk lines, cross connects, interconnects and local area networks (LANs) are discussed. Transmission frame processing suitable for photonic implementation is investigated. It is also shown that the applications of this type of line code to superbroadband cross connects, interconnects, and LANs are promising owing to simple clock recovery and frame processing capabilities